Error when include QZXing.pri

[nikosvr88]

I've included the QZXing.pri into my project but when start build the following error occured: 'to_string' is not a member of 'std' --------> file: DataCharacter.cpp line 31

Any ideas? I use Qt 5.9.6

[ftylitak]

Hello @nikosvr88

Which platform are you targeting?

Can you share any compilation logs?

[nikosvr88]

Hi @ftylitak I am trying to compile for android armv7a.

../../MobileApp/app/ExternalLibs/QZXING/zxing/zxing/oned/rss/DataCharacter.cpp: In member function 'zxing::String zxing::oned::rss::DataCharacter::toString() const':
../../MobileApp/app/ExternalLibs/QZXING/zxing/zxing/oned/rss/DataCharacter.cpp:31:19: error: 'to_string' is not a member of 'std'
     return String(std::to_string(m_value) + '(' + std::to_string(m_checksumPortion) + ')');
                   ^
../../MobileApp/app/ExternalLibs/QZXING/zxing/zxing/oned/rss/DataCharacter.cpp:31:51: error: 'to_string' is not a member of 'std'
     return String(std::to_string(m_value) + '(' + std::to_string(m_checksumPortion) + ')');
                                                   ^
../../MobileApp/app/ExternalLibs/QZXING/zxing/zxing/oned/rss/DataCharacter.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
make[1]: *** [DataCharacter.o] Error 1
make: *** [sub-app-make_first] Error 2

[ftylitak]

Ok, since you are targeting Android i would like some more info:

• Android API level you are targeting (example: 28 -> Android 9)
• NDK version that you are using (example: 10e, 19c, etc.)
• JDK version
• Development machine OS (Linux, Windows..)

Since i can not find a apparent reason why you are having this compilation issue, as soon as you send me those info I will try to setup a development machine like yours and try to reproduce it.

[nikosvr88]

@ftylitak

• java-8-openjdk-amd64
• android-ndk-r15c
• android 28
• kubuntu 16.04 lts

[nikosvr88]

@ftylitak in order to solve the problem i've added the following code in every file that uses std::to_string

include

using namespace std;

namespace std { template < typename T > std::string to_string( const T& n ) { std::ostringstream stm ; stm << n ; return stm.str() ; } }

[nikosvr88]

@ftylitak i have a problem when i am trying to scan barcode. Nothing happens, i mean that not reads the barcode. My code is the following:

import QtQuick 2.0
import QtMultimedia 5.5
import QZXing 2.3

Item {
    Camera {
        id: camera
        exposure.exposureMode: Camera.ExposurePortrait
        focus {
            focusMode: CameraFocus.FocusContinuous
            focusPointMode: CameraFocus.FocusPointAuto
        }
    }
    VideoOutput {
        id:videoOutput
        anchors.fill: parent
        source: camera
        filters: [ zxingFilter ]
        orientation:-90
    }
    QZXingFilter {
        id: zxingFilter
        decoder { 
            onTagFound: {
                console.log(tag);
            }
        }
    }
}

[ftylitak]

Leaving aside the issue that no barcode is decoded which will be examined in #138, to remove the workaround that you have added and keep the code simple i believe that you should change the NDK version to 10e.

I thing that Qt 5.9 was suggesting only NDK 10e. Could you try this?

[ftylitak]

@nikosvr88 do you have any update on this?

[ftylitak]

Closing due to inactivity.